I think they are seriously trying to work out how to get more or at least the same as before.
That, on an overall basis, shouldn't be too hard if you believe the previous spin that the current fees don't fully cover merchant fees .... $30 fee on a $130 fare will more than cover merchant fees, but a $30 fee on a $6000 fare most likely won't ... Yet % fee on all fares may mean that the fee on the $130 fare comes down to $2.60 whilst the $6k fare may go up to $120 .... So overall fee is now $122.60 vs $60 before.